Stylus for sound-reproducing machines.



S. LEVIN.-

STYLUS FOR SOUND REPEODUGING MACHINES.

APPLICATION FILED SEPT. 19, 1910.

1 ,OO3,474, Patented Sept. 19, 1911.

. .gtboeAm.

"ffToio lZ whom it may concern:

UNITED STATES .rnrrnntr oFFIoE.

SAMUEL LEvIN or HIGHLAND PARK, ILLINOIS.

Specification of Letters Patent.

Patented Sept. 19, 1 911.

. Application filed September 19, 1910. Serial N 0. 582,674.

Be it known that I, SAMUEL LEVIN, a citizen of the United States,residing at Highland Park, in the county of Lake and State of Illinois,have invented certain new and useful Improvements in Styli for Sound-Reproducing Machines, of which the following is a specification,reference being had to the accompanying drawings.

This invention relates to styli for soundreproducing machines of thegramophone type, and has for its object to produce a new and improvedform of stylus which may be useda great many times without injury eitherto the stylus or to the disk record so that the operator is relieved ofthe necessity of changing the stylus at each op eration as is necessaryin the use of a stylus of the ordinary type. I accomplish this object bythe use of a stylus having a jewel point of a peculiar form, asillustrated in the drawings and hereinafter specifically described.

That which I believe to be new is set forth in the claims.

In the drawings,-Figure 1 is a fragmentary side View of the rotary tableand record disk of an ordinary gramophone, with the ordinary reproducerin position thereon with the stylus engaging the soundgroove in therecord, the view being toward the center of the rotary table. Fig. 2 isanenlarged detail, being a very much enlarged section on the line 2-2 ofFig. 1, and show ing the sound-groove in therecord. Fig. 3 is astillmore enlarged detail, being an enlarged section on line 3-3 of Fig.2. Fig. 4 is a section on line 4-4 of Fig. 3. Fig. 5 is a view of thejewel as seen from the right in Fi 3.

l teferring to the several figures of the drawings, in which thecorresponding parts are indicated by like reference characters,- 10indicates a reproducer of the ordinary general type, of which 11indicates the socket-member in which the stylus 12'is to be inserted,being retained in position there'- in by the set-screw 13.

14 indicates the rotary table upon which the sound-record 15 is revolved1n the di-' rection indicated by the large arrow 'in' is best shown inFigs. 3 and 4, the stylus proper or stem 12 is provided with a deep oove16 at one side atthe lower end. 17 indicates a jewel secured in saidgroove by chines of t means of cement or in any other suitable manner.is substantially in the shape ofa semi-circle, with the straight; sideof the jewel set at an angle of approximately ixty degrees to the faceof the record, and with thecurved portion of the periphery of the jewelin'advance in the direction of the movement of that portion of therecord with which 'the jewel is in contact. That is to. say, .thestraight edge of the jewel is first brought into contact with thesuccessive variations in the record groove. The edge of the-jewel whichis toward the center of the record is rounded off (see Figs. 2, 4-and 5)so that the jewel is in effect substantially plano-convex, the edgeWhich is toward the outside being also very slightly rounded as are alsothe points of the jewel, as best shown at 18 in Fig. 3, I have foundbyexperience that a stylus of this character 'is very eflici'ent. The

sound-groove of the record does not become quickly worn. but ,on thecontrary the record still retains its superiority after having been useda great many times with a single stylus.

The jewel is large enough in cross-section to insure its being noteasily broken, and its peculiar shape with the flat face outside enablesthe stylus to traverse the. groove many times following closely theoriginal sinuous outline without materially wearing away the fine pointsalong the sides of the groove. Moreover, I havefound that as the jewelis gradually worn, the wear is such as to preserve substantially theoriginal shape of the engaging point of the jewel.

What I claim as my invention and desire to secure by Letters Patent i's,

' 1. A stylus for sound-reproducing ma- As best shown in Fig. 3, thejewel chines'of the gramophone type, the operative point. of which isplano-convex, the edge of said point which first engages the varlationsof the record groove being straight and set at an angle to the face ofthe record.

2. A stylus for sound-reproducing machines of the gramophone ty e, theoperative point of which is formed 0 a thin substantially lano-convexjewel whose lower pointed end is defined by a straight line and a curvedline, said jewel being positioned so that its straight'edge firstengages the variations of the record groove in the rotation of therecord, said straight edge being set at an angle to the face of therecord."

r 3. A st lus for sound-reproducing maiie gramophone type, the operativepoint of which is formed of a thin substantially plano convex jewelwhose lower pointed end is defined by a straight line and tion of therecord, said straight edge being at an angle to the face of the recordthe convex face of said jewel being positioned toward the center of therecord;

4. A stylus for sound-reproducing machines of the gramophone type, theoperative point'of which is formed of a semicircular lano-convex jewelhaving its edges and its points slightly rounded, said jewel beingpositioned so that its straight edge first engages the variations of therecord groove in the rotation of the record, said straight edge being atan angle to the face of the record.

5. A stylus for sound-reproducing ma-. chines of the gramophone type,the operative point of which is formed of a semicircular lano-convexjewel having its edges audits points slightly rounded, said jewel beingpositioned so that its straight edge first engages the variations of therecord groove in the rotation of the record, said straight edge beingat-an angle to the face 30 of the record, the convex face of said jewel.a stem and a thin substantia being positioned toward the center of therecord.

6. A stylus for sound-reproducing machines of the gramophone type,comprising 1y semi-circular plano-convex jewel secured to the lower endof said stem with the straight edge substantially parallel with thestem.

7. A stylus for sound-reproducing machines of the gramophone type,comprising a stem and a thin substantially lano-convex jewel secured tothe lower end of said stem, the lower pointed end of said jewel beingdefined by a straight line and a curved line, said straight edge beingsubstantially parallel with the stem.

8. A stylus for sound-reproducing machines of the gramophone type,comprising a stem and a thin substantially lano-convex jewel secured tothe lower end of said stem, the lower pointed end of said jewel beingdefined by a straight line and a curved line, said straight edge beingsubstantially parallel with the stem, the operative point and the edgesof said jewel being slightly 5'3 rounded.

SAMUEL LEVIN. Witnesses:

C. E. PICKARD, W. H. DE BUBK.

